Many would have you believe digital image capture will solve every photographic problem you have ever had, seen, or imagined. There is a fairly good reason for this, and it's called money....Photography magazines certainly won't tell you the shortcomings of the technology being pushed by their advertisers. All of this feeds those who make a bundle offering "digital" classes and workshops. Who could blame them for not publicizing the shortfalls of going digital?
When you shoot film, you use a fresh piece of film for every exposure. While a speck may get to the film’s surface once in a while, it is usually not enough to be noticed....In a digital [SLR] camera the image sensor replaces film and it is there for the life of the camera. Dust accumulates on it and you end up with spots all over your images....The actual pieces of dust are invisible to the eye, so you need to clean them off without seeing where they are.
While on-camera displays prevent terrible exposure mistakes, they do not help with subtle exposure errors in the range of 1/3 or 1/2 stop. Shooting RAW files gives you the ability to correct some exposure error later when the file is processed, but digital cameras have absolutely zero tolerance for overexposure when shooting JPEG files. It is common to discover that some fine details are overexposed when a photograph is viewed on a large monitor, even though it and its histogram looked great when it was viewed on the camera’s LCD. Some details are simply too small to show up as flashing pixels on the tiny display. Since they are small they do not shout at you from the histogram either.